Comparison
304 vs 316 vs 316L vs 316Ti
All chemistry limits are from ASTM A240/A240M. The 316Ti specification follows EN 10088-2 (1.4571) and GOST 9941-81 (08Х17Н13М2Т) conventions, which are functionally equivalent to the ASTM chemistry for S31635.
| Property | 304 (UNS S30400) | 316 (UNS S31600) | 316L (UNS S31603) | 316Ti (UNS S31635) |
|---|---|---|---|---|
| Chromium (Cr) | 18.0 – 20.0% | 16.0 – 18.0% | 16.0 – 18.0% | 16.0 – 18.0% |
| Nickel (Ni) | 8.0 – 10.5% | 10.0 – 14.0% | 10.0 – 14.0% | 10.0 – 14.0% |
| Molybdenum (Mo) | — | 2.0 – 3.0% | 2.0 – 3.0% | 2.0 – 3.0% |
| Carbon (C) max | 0.08% | 0.08% | 0.030% | 0.08% |
| Titanium (Ti) | — | — | — | 5×(C+N) min, 0.70% max |
| Sensitization Protection | None | None | Low carbon (≤0.030%) | Ti stabilization |
| Tensile Strength (min) | 515 MPa | 515 MPa | 485 MPa | 515 MPa |
| Yield Strength (min) | 205 MPa | 205 MPa | 170 MPa | 205 MPa |
| PREN Value | ~19 | ~26 | ~26 | ~26 |
| Common Fitting Specs | A182 F304, A403 WP304 | A182 F316, A403 WP316 | A182 F316L, A403 WP316L | A182 F316Ti, A403 WP316Ti |
| Relative Cost Index | 1.00 | 1.30 – 1.45 | 1.33 – 1.48 | 1.35 – 1.50 |
316L and 316Ti both solve the sensitization problem, but they do it through fundamentally different metallurgical mechanisms. 316L uses the low-carbon approach: by limiting carbon to 0.030%, there is insufficient carbon available to form chromium carbides at grain boundaries. 316Ti uses the stabilization approach: by adding titanium, the carbon is preemptively tied up as titanium carbide (TiC) before it can combine with chromium.
Both approaches work. The low-carbon approach is simpler — no additional alloying element, no risk of TiN inclusions, no concern about TiC over-aging. The stabilization approach has a hidden advantage: because the carbon is still present (0.08% max), 316Ti retains slightly higher elevated-temperature strength than 316L. The TiC dispersion pins dislocations and grain boundaries at temperatures above 400°C, giving 316Ti better creep resistance than 316L. For service below 400°C, this advantage is irrelevant. For service at 500–700°C, it can be decisive.
In Western Europe and North America, 316L (EN 1.4404, UNS S31603) is the default corrosion-resistant austenitic grade. In Eastern Europe, Russia, and the CIS, 316Ti (EN 1.4571, GOST 08Х17Н13М2Т) is the default. This is not a technical superiority — it is a historical standardization path. The GOST standards were developed when titanium-stabilized grades were the state of the art for weldability, and the low-carbon "L" grades had not yet become widely available in the Soviet supply chain. Russian engineers and specification writers continue to prefer 316Ti because it is familiar, well-proven in their installed base, and does not require the same mill process control as 0.030% carbon production.
At HT PIPE, we maintain stock of both 316L and 316Ti pipe and fittings in our Wuxi warehouse. When a Russian buyer sends a specification calling for 08Х17Н13М2Т, we supply 316Ti with an EN 1.4571 certificate. When a German buyer calls for 1.4404, we supply 316L. The materials are functionally interchangeable for most applications, but the documentation must match the national standard to avoid inspection rejections at the port of entry.
At room temperature, 316Ti and 316L have similar tensile properties. 316Ti tensile minimum is 515 MPa; 316L is 485 MPa. The yield difference is more significant: 205 MPa versus 170 MPa. Where they diverge is above 400°C. The TiC dispersion in 316Ti provides precipitation strengthening that persists to approximately 750°C. At 600°C, the 0.2% proof strength of 316Ti is approximately 110 MPa, versus 95 MPa for 316L. At 700°C, the gap widens to 75 MPa versus 60 MPa. For pressure equipment designed to ASME Section VIII, this translates to higher allowable stresses at elevated temperature and potentially thinner wall sections.
One caution: the TiC that provides this strength also makes 316Ti slightly less formable than 316L. For cold-bending tube bends below 3×D radius, 316L is the easier material. For U-bend heat exchanger tubes where the bend radius is typically 1.5×D, we recommend 316L unless the service temperature specifically demands 316Ti.
316Ti welds with ER316Ti filler, which contains titanium to match the stabilization of the base metal. 316L welds with ER316L filler, which is low-carbon. Both weld beautifully with TIG and MIG processes. The practical difference is in post-weld handling. 316Ti does not require a post-weld anneal because the TiC is already stable; the weld HAZ is immune to sensitization as long as the Ti content is sufficient. 316L also does not require post-weld anneal for the same reason — the low carbon prevents sensitization. So in terms of welding practice, both are "weld and go" grades.
The difference appears when welding 316Ti to 316L. In that case, we use ER316Ti filler. The titanium stabilizes the weld deposit, and the low carbon on the 316L side means there is no sensitization risk regardless. The reverse — using ER316L filler on a 316Ti joint — is acceptable for room-temperature service but not ideal for high-temperature service because the Ti-free weld deposit lacks the elevated-temperature strength of the base metal.
We recommend 316Ti over 316L in three specific scenarios:
For all other applications — ambient temperature, welded chemical piping, food and beverage, marine atmospheres — 316L is the simpler, more widely available, and slightly cheaper choice.
Our 316Ti order book is heavily concentrated in the Russian and CIS markets. In 2024–2025, we received two inquiries that illustrate the regional preference:
Our guidance to Western buyers: if you are exporting equipment to Russia, Ukraine, Belarus, or Kazakhstan, always check whether the specification calls for 316Ti (08Х17Н13М2Т) rather than 316L. The substitution may seem technically equivalent, but it will fail at the customs inspection or commissioning stage if the documentation does not match the spec exactly.
316L prevents sensitization by limiting carbon to 0.030%. 316Ti prevents sensitization by adding titanium, which forms stable TiC carbides that lock up carbon before it can form chromium carbides. 316Ti retains slightly higher elevated-temperature strength due to TiC precipitation strengthening. 316L is the Western standard; 316Ti is the Eastern European and Russian standard. Both are immune to weld decay.
Technically yes, but procedurally it requires approval. 316Ti and 316L have the same PREN (~26) and the same corrosion resistance. The mechanical properties are slightly different: 316Ti has higher minimum tensile (515 MPa vs 485 MPa) and yield (205 MPa vs 170 MPa). For most piping applications, the substitution is an upgrade. However, the MTC must show compliance with the specified standard (ASTM A240 for 316Ti vs A240 for 316L), and the material certification must match the design dossier. We always recommend obtaining a written deviation approval before substituting.
No. Both grades have the same chromium, nickel, and molybdenum content, so the PREN and pitting resistance are identical. The titanium in 316Ti does not improve the passive film or enhance chloride resistance; it only stabilizes the microstructure against sensitization. If you need better corrosion resistance than 316L/316Ti, step up to 317L (PREN ~30) or 254SMO (PREN ~42).
ASTM A240 specifies Ti = 5×(C+N) minimum, 0.70% maximum. For a typical carbon of 0.05% and nitrogen of 0.01%, the minimum Ti is 5 × 0.06 = 0.30%. The EN 10088-2 equivalent (1.4571) specifies Ti ≥ 5×C and between 0.40% and 0.70%. Our QC checks both the ratio and the absolute value against the relevant standard before accepting material.
Yes, by approximately 2–5% depending on the product form. The titanium addition adds cost, but the difference is smaller than the 316L premium over 304 because Ti is less expensive than the nickel and molybdenum already present. For pipe, the 316Ti premium is typically 2–3%. For forgings, it is 3–5% due to the narrower forging temperature window and the need to avoid Ti-rich surface segregation.
Yes. Use ER316Ti filler. The titanium stabilizes the weld deposit, protecting both sides. Alternatively, ER316L filler can be used for room-temperature service, but for elevated-temperature service the Ti-free weld deposit will have lower creep strength than the 316Ti base metal. We recommend ER316Ti for all mixed joints to maintain maximum performance across the temperature range.